Production of colored photographs.



No. 654.766. Patented July 3|, I900. G. SELLE.

PRODUCTION OF COLORED PHOTOGRAPHS.

(Application filed Dec. 7, 1898.)

(No Model.)

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UNITED STATES PATENT OFFICE.

GUSTAV sELLE, or BRANDENBURG-ON-THE-HAVEI), GERMANY;

eme-rm COLORED PHOTOGRAPHS.

srncrmonrron forming part of Letters Patent m5. 654,766, drama 31, 1906. Application filed December 7,1898. Serial NO- 6983579. (No specimens.)

To all whom it may concern: Be it known that I, GUSTAV SELLE, a subject of the German Emperor,land a resident of Brandenburg-onthe-Havel, in the Empire of Germany, have invented certain new and useful Improvements in the Production of Colored Photographs, of which the following is a specification.

' The methods hitherto used for obtaining IO three-colored photographs directly on paper are, apart from ordinary mechanical printing, of which there is no question here, the threecolored collotype-printing and the india-rubber printing. The three-colored collotype I 5 print is very suitablefor large editions, but too expensive for small editions, while with india-rubber printing all the fineness of the photograph is lost by the over painting, and it cannot properly be called a photographic 2o process. With the known chrome gelatine-mordant process upon collodion skins it hitherto has only been possible to obtain a positive mounted on paper by first making the different monocolored chrome-gelatine, 2 5 mordant pictures as transparencies on collodion skins and then placing them one upon the other and by afterward pasting these on paper. This method is not suitable for paper photographs, and by the present process the production of such photographs'is obtained directly on paper.

The accompanying drawing illustrates the invention by means of a section through the finished print, the thicknesses being greatly 3 5 exaggerated.

The paper a is impregnated with a waterproof layer bas, forinstance, collodion. On this is poured a light sensitive layer cfor instance,a ohrome-gelatine solution--suitable by the change efiected in it by exposure to light under the negative to receive on the same spots color from a color-bath. When this sensitized layer is dry, one of the three negatives (producedin the known manner by three consecutive exposures behind three light-filters in the ground colors) is laid upon the sensitive layer. After exposure to light the negative is removed and the picture is washed with cold water and developed by immersing in a color-bath complementary to the respective light-filter. This photograph is then again covered with a waterproof layer b and this after drying again covered with a sensitive layer 0 exposed under the second negative, and thereupon the second photograph is in a similar manner developed upon the picture lying under it in a second colorbath complementary to the light-filter of the respective negative. After again covering this two-colored photograph with a waterproof layer 17 and pouring on a third sensitive layer 0 and drying, it is exposed for a third time beneath the third negative, and the third positive image is developed similarly upon'the two underlying positives. The three-colored picture is thus obtained and should be covered by a collodion layer b It is necessary that the paper shall present during the aforesaid operations a level and tightly-stretched surface which shall remain 7o unaltered and beyond direct influence of the color-baths. To this endthe paper, provided with an adhesive border 01, is first stretched on a rigid planefor.instance, on a sheet of glass 6. The latter acts as a protection for the back of the paper, the surface being protected by the waterproof layer b aforesaid. When the print has undergone all the aforesaid operations and is finished, it is cut all around within the adhesive borders d-for 8o example, on the lines ff-when the print will come off clear of the glass e and can be mounted like any ordinary print. 4

In order to produce the three pictures exactly one upon the other where perhaps thick opaque paper is used, it is desirable in a similar manner, as is done in multicolor-printing, to make'corresponding register-marks on the negative, which become subsequently duplicated on the positive, so that there is no dif- 9o ficulty in obtaining a true register.

I claim as my invention 1. The process of production of multicolored-paper photographs consisting in covering the paper with a waterproof layer, then with a sensitive layer exposing and developing the latter for one color, again covering same with a waterproof layer then with a sensitive layer, exposing and developing the lattor for another color and repeating the oper- 10o ations of waterproofing sensitizing exposure and development for each additional color.

2. The process of production of multicolored-paper photographs consisting in covering the-paper with a layer of collodion, then with a sensivive layer, exposing and developing the latter for one color again covering same with collodion then with a sensitive laver exposing and developing the latter for another color, and repeating the operation of covering with collodion layer, with sensitive layer, exposure and development foreach-ad- (litional color. w

8. The process of production of multicolcred-paper photographsconsistin gin stretch ing the paper securely onan impervious plane, surface covering the paper with a waterprQQf,

layer, then with a sensitive layer exposing and developing the latter for one color, again covering same with a waterproof layer, then with a sensitive layer, exposing and develop-s ing the latter for another color and repeating the operations of waterproofing, sensitizing exposure and development for each additional color and afterward removing the paper from the plane surface. a

4'. The process of production of' multicolored-paper photographs consistingin stretching-the'paper securely on an impervious plane surface covering the paper with a layer of l collodion, then'withf as'ensitive layer, exposing and developing the latter for one color again coveringsame with collodion then with a sensitive laver exposing and developing the latter for another'color and repeating the operations of covering with collodion layer, with sensitive layer exposure and' development foreach additional color and afterward .removing the paper from the plane surface.

Witnesses i HENRY HASPER,

E. L. GOLDSCHMIDT.

In witness whereof I have signed this speci 

